Quando tento chamar um serviço WCF, recebo a seguinte mensagem "Ocorreu um erro ao verificar a segurança da mensagem".

Quando removo a autenticação personalizada, o serviço não funciona. Não consigo descobrir o que configurou incorretamente no meu web.config. Qualquer insight seria apreciado.

  <system.serviceModel>
     <services>
        <service behaviorConfiguration="NAThriveExtensions.nableAPIBehavior"
          name="NAThriveExtensions.nableAPI">
           <endpoint 
             address="" 
             binding="basicHttpBinding" 
             bindingConfiguration="basicHttpBinding_Secure"
             contract="NAThriveExtensions.InableAPI">
           </endpoint>
           <endpoint 
             address="mex" 
             binding="mexHttpsBinding" 
             contract="IMetadataExchange" />
        </service>
     </services>
     <behaviors>
        <serviceBehaviors>
          <behavior name="NAThriveExtensions.nableAPIBehavior">
            <serviceMetadata httpsGetEnabled="true" />
            <serviceDebug includeExceptionDetailInFaults="false" />
            <serviceCredentials>
              <userNameAuthentication 
                userNamePasswordValidationMode="Custom" 
              customUserNamePasswordValidatorType= "NAThriveExtensions.Authentication, NAThriveExtensions" />
            </serviceCredentials>
          </behavior>
        </serviceBehaviors>
     </behaviors>
     <bindings>
       <basicHttpBinding>
         <binding name="basicHttpBinding_Secure">
           <security mode="TransportWithMessageCredential">
             <message clientCredentialType="UserName"/>
           </security>
         </binding>
       </basicHttpBinding>
     </bindings>
  </system.serviceModel>